Bass Boost Calculator

Definitions

ƒc — The frequency at which the boost is +3 dB;
the corner frequency of the filter. Below this frequency, the PPA
bass boost increases by 6 dB each time you divide the frequency
in half, up to the point where the shelving action kicks in.

ƒs — The frequency at which the boost curve is
3 dB below the maximum boost value; the shelving frequency of
the filter.

ƒo — Frequency where the gain is half the total
boost. Used when boost is 6 dB or less, since ƒc and ƒs
cross each other at this point.

I Know What Resistor Values I Will Use, What C7 Will Give
Me the ƒc I Want?

This calculator will help you pick a C7 value given the ƒc and the
R3, R4 and R7 values. The answer will not be rounded off to a standard
value, since different capacitor lines have different standard values.

You may use power notation for the resistors: 120K, 1.0M, etc. The
power suffix can be uppercase or lowercase.

Given:

R3:

Ω

R4:

Ω

R7:

Ω

ƒc:

Hz

This
calculator requires JavaScript.

The formula for this is:

where

and

Given All the Component Values, What Filter
Characteristics Will I Get?